Influence of Shape Anisotropy on the Emission of Low-Dimensional Semiconductors

Abstract

The emergence of precise and scalable synthetic methods for producing anisotropic semiconductor nanostructures provides opportunities to tune the photophysical properties of these particles beyond their band gaps, and to incorporate them into higher-order structures with macroscopic anisotropic responses to electric and optical fields. This perspective article discusses some of these opportunities in the context of colloidal semiconductor nanoplatelets, with a focus on the influence of confinement anisotropy on processes that dictate the emission.

Effect of Crystal Structure on the Aggregation of CdS Quantum Dots: Consequences for Photophysical Properties and Photocatalytic Hydrogen Evolution Activity

“…4 Therefore, factors like charge carrier mobility and rate of charge transfer and recombination can impact the catalytic efficiency of the material. Additionally, the preparation of semiconductor nanoparticles in the quantum confinement regime (<5.6 nm diameter for CdS) results in further differentiation depending on the size, 10,11 shape, 12 and surface ligation. 11,13 It is common in semiconductors with polytypism to observe a difference in the photocatalytic activity depending on their structure.…”

Recent progress of group III–V materials-based nanostructures for photodetection

“…Compared to bulk materials, they exhibit the advantages [53][54][55]: (i) Nanostructure materials generate the strong quantum confinement resulting in more stable excitons and enhancing the energy transfer efficiency. (ii) Nanostructure materials can be easily combined with other materials and used to design optoelectronic devices by stacking homojunctions or heterojunctions with specific wavelength ranges.…”

Emerging quasi-one-dimensional material NbS4 with high carrier mobility and good visible-light adsorption performance for nanoscale applications

“…33 VS 4 displayed a Peierls distortion, a narrow bandgap of B1.0 eV and relatively high electronic conductivity, serving as a novel and promising cathode material with high capacity and long cycling life for Mg batteries. 34 The reduced dimension of the quasi-1D materials gives rise to significant spatial anisotropy, quantum confinement 35,36 and many new properties, such as optical anisotropy, 37,38 topological insulator, 39 charge density wave, 40 superconductor-insulator transition, 41 and bandgap opening. 42,43 The excellent properties and interesting physics of the quasi-1D trichalcogenides and tetrachalcogenides have attracted interest in NbS 4 .…”